go out of fashion
To no longer be trendy or fashionable. If skinny jeans ever go out of fashion, I'll have no pants to wear. I'm sorry, Grandma, but shag carpeting has definitely gone out of fashion.
go out of fashion
and go out of style; go outto become unfashionable; to become obsolete. That kind of furniture went out of style years ago. I hope this kind of thing never goes out of fashion. It went out years ago.
go out of fashion
Also, go out of style. See under go out, def. 5.